fixup! [p] Extract is_stitched from manifest entries (partial #6299)

src/humancellatlas/data/metadata/api.py

@@ -18,7 +18,7 @@
     chain,
 )
 from typing import (
-    AbstractSet,
+    Collection,
     Iterable,
     Mapping,
     MutableMapping,
@@ -977,11 +977,11 @@ def __init__(self,
                  manifest: MutableJSONs,
                  metadata_files: Mapping[str, JSON],
                  links_json: JSON,
-                 stitched_entity_ids: AbstractSet[str] = frozenset()):
+                 stitched_entity_ids: Collection[str] = ()):
         self.uuid = UUID4(uuid)
         self.version = version
         self.manifest = {m.name: m for m in map(ManifestEntry, manifest)}
-        self.stitched = stitched_entity_ids
+        self.stitched = frozenset(map(UUID4, stitched_entity_ids))
 
         json_by_core_cls: MutableMapping[type[E], list[tuple[JSON, ManifestEntry]]] = defaultdict(list)
         for file_name, json in metadata_files.items():
@@ -1079,7 +1079,7 @@ def not_stitched(self, entities: Mapping[UUID, E]) -> list[E]:
         return [
             entity
             for uuid, entity in entities.items()
-            if str(uuid) not in self.stitched
+            if uuid not in self.stitched
         ]
 
     @cached_property